12-2. AE Sensor
In the Auto Exposure Mode, the AE Sensor on AE Sensor Board PWB-H
measures the intensity of the light reflected off the original, which results in
the black/white ratio of a 210-mm-wide area from the reference position of
the original being measured. According to this measurement, the Exposure
Lamp voltage is automatically increased or decreased so that copies of
consistent quality are produced.
The output from the AE Sensor is applied to PWB-A which, in turn, varies the
duty ratio of the AVR Remote from it to vary accordingly the LA1 voltage.
Original Density (B/W Ratio) High Low
Intensity of Reflected Light Low High
PWB-H Output High Low
AVR Duty Decreased Increased
LA1 Voltage Increased Decreased
1139C14MAA
M-36
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